ROC LL1GBQ24-B26CG, Руководство по использованию, установке и обслуживанию

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Warning
The anti-freeze function shall not ensure the water can circulate in the whole
heating system.
If the gas boiler stop running for several hours in very cold weather, it may cause
the system to freeze. If you are not at home during freezing period, be sure to
keep the heating function running, and keep the temperature of every room
above the freezing point.
Warning
When the gas boiler is performing the anti-freeze function, it may need to
conduct combustion work. So you must ensure the gas supply is smooth and
water in the heating system is enough.
However, when there is some external failure, such as gas or power outage or
air exhaust system are abnormal, the inner monitoring device will turn off the
boiler automatically, so it can’t protect against freezing. To avoid such situation,
if there are no people at home for long time during freezing periods, you can ask
the installer/engineer to drain out the water in heating system and gas boiler.
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6.1 Anti-freeze functi on
The gas boiler has anti-freeze function.
If the gas and power is on, when the heating water temperature is below 5 °C ,
the boiler will start to work automatically, and heat the water in the system to
about 30 °C .